NAVY MIL-T-81521 A (3)-1977 TAPE TEXTILE NYLON LANDBASED ARRESTING GEAR 7 INCH《7英寸地面抓捕齿轮尼龙纺织磁带》.pdf

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1、 . MIL-TK5Z(AS) AMENDMENT 3 27 December 1977 SUPERSEDING . AMENDMENT 2 1 October 1974 MILITARY SPEC1 FI CATI ON TAPE, TEXTILE, NYLON, LANDBASED ARRESTING GEAR, 7 INCH This amendment forms a part of Military Specification MIL-T-81521A(AS) , dated 24 April 1969. PAGE 1. * 2.1, delete in its entirety a

2、nd substitute the following: “2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal form a part of the spec- ification to the extent specified herein, S PECI FI CATIONS Mi 1 i tary MIL-B-131 -Barrier Material, Watervaporproof, F1 exi bl e? Heat Sea

3、l ab1 e STANDARDS Federal FED-STD-191 -Textile Test Methods Mi 1 i tary MIL-STD-105 MI L-STD- 129 MIL-STD-1480 -Sampling Procedures and Tables for Inspection -Marking for Shipment and Storage -Color Codes for Webbing, Textile; Man- by Attributes ufacturers I Identification FSC 8315 THIS DOCUMENT CON

4、TAlNS,PAGES Licensed by Information Handling ServicesMIL-T-81521A(AS) AMENDMENT 3 DRAW I NGS Naval Air Engineering Center B506730 -Tape Reel Assembly, Tape Installation Method (7 Inch Tape) 508306 -Reel, Tape Assembly (When requesting specifications, standards, and publications, refer to both title

5、and number. documents may be obtained upon application to the Comanding Officer, Naval Publications and Forms Center, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. procuring activity or as directed by the contracting officer. )I Copies of this specification and applicable All other documents

6、should be obtained from the PAGE 2 2.2 Delete the following: “U.S. Air Force Specification Bulletin No, 90 Color Codes Manufacturers Identification, Nylon Webbing (Application for copies should be addressed to the procuring activity or as directed by the contracting officer, )I PAGE 3 TABLE I: Under

7、 “REQUIREMENT“ column and after “70,000“ insert x/. I above 70,000 pounds tension or a jaw break at or above 70,000 pounds will be considered acceptable. a jaw break below 70,000 pounds will be considered unacceptable. “ At bottom of table insert the following: “lJ A failure at or A failure below 70

8、,000 pounds tension or PAGE 5 3.5, line 2: Delete entire line and insert “contain either 1375 plus or minus 5 foot or 1500 plus or minus 5 foot lengths as speci-“ 3.5, line 4: Delete “25t1 and insert “10.“ 3.6.1, delete in its entirety and substitute the following: with butyl ricinoleate (see 6.5).

9、in a ratio of 3 parts carbon black to 100 parts resin. be applied from a water dispersion, dried and cured so as to form a firmly adherent and evenly distributed deposit or coaing on the yarns of the tape (see 6.6).“ “3.6.1 The tape shall be impregnated with polyvinyT butyral plasticized The resin s

10、hall contain carbon black The resin shall Page 2 of 9 Licensed by Information Handling ServicesflIL-T-81521A (3) 3 799770b 0404880 T W MI.L-T-81521A( AS) AMENDMENT 3 3.6.3, delete in its entirety. I 3.7.1, delete in its entirety and substitute the following: “3.7.1 Manufacturers identification. Each

11、 manufacturer shall incorporate as part of the binder warp at the center of the tape two ends dyed to match the shade assigned to the manufacturer in accordance with MIL-STD-1480. A producer not listed in MIL-STD-1480 shall apply to the Comnander, US Army Natick Research and Development Comnand, Nat

12、ick, Massachusetts 01760, for assignment of color coding. The colorfastness of this yarn shall be rated as “Fair“ or “Good“ when tested as specified in Table II.“ PAGE 6 4.1, delete and substitute: “4.1 Responsibility for inspection, Unless otherwise spec- ified in the contract, the contractor is re

13、sponsible for the perfom- ance of all inspection requirements as specified herein. Except as otherwise Specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government.

14、 The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. II PAGE 7 4.4.4.1, delete (a) and (b) and substitute: “(a) Yard-by-yard. Prior to the ad

15、dition of resin as speci- fied in 3.6, a one yard unit of each production tape length shall be inspected as specified in 4.5.4.1 and 4.5.4.1.1 at intervals of approximately 40 feet. (b) Overall. Each production tape length shall be examined for the defects specified in 4.5.4.2.“ 4.5.1, line 1: Delet

16、e “CCC-T-191“ and substitute “FED-STD-191“. Page 3 of 9 Licensed by Information Handling ServicesMIL-T-I521A (3) 3 W 777770b OLIO4883 I W MIL-T-81521A(AS) AMENDMENT 3 TABLE II, delete in its entirety and substitute the following: * TABLE II. Tests and test methods SAMPL I NG PLAN A A A A A A A B B B

17、 B TEST Width Th i c kness Weight Length Breaking strength Extractable matter Resin Ends in warp Ground Binder Stuffer Filling, yarn per in. Yarn ply Ground Binder Stuffer Fi 1 1 ing Twist, turn per in. Ground Binder MET FED-STD-191 METHOD NO. . 5020 5030 L/ 5040 5010 - 51 5050 4054 A/ 4054 A/ Page

18、4 of 9 D OTHER 4.5.2 4.5.3 4.6 Visual Visual Visual Visual Visual Visual Visual Licensed by Information Handling ServicesMIL-T-81521A (3) 83 W 7799906 OLIO4882 3 W MIL -T-8152 1 A ( AS ) AMENDMENT 3 TABLE II. Tests and test methods -(Continued) SAMPLING PLAN TEST Stuffer Filling Weave Colorfastness

19、to 1 aunderi ng Melting point Denier Fi 1 ament count Y ard-by-yard Overall METH( FED-STD- 19 1 METHOD NO, 4054 0 4054 0 5614 g/ 21 1534 - 51 4021 g/ - 51 OTHER Figure 1 4.6 4.6 Vi cual 4.5.4.1 4.5.4.2 i/ Except that a six ounce total load shall be applied and the presser 2/ 3/ 41 s/ - 4.5.2.1, line

20、 5: 4.5.2.2, shall be cut from each tape as noted in 4.5.2.3. The specimen shall be 1 oad tes ted. I foot diameter shall be 3/8 inch. Applicable only to manufacturers identification yarns. Except that nylon color transfer cloth shall be used. One test on each 5 yarns. Unless otherwise specified, a s

21、uppliers certificate of compliance is required and will be accepted for the requirement (See 4.6). Delete “3 feet 6 inches“ and insert “18 inches.“ Delete entire paragraph and insert the folfowing: “4.5.2.2 Ultimate strength test. A test specimen 10 feet long Page 5 of 9 c - c,) I Licensed by Inform

22、ation Handling ServicesMI L-T-81521A( AS ) AMENDMENT 3 PAGE 10 4.5.2.3, delete the entire paragraph and substitute the following: “4.5.2.3. Method of sampling for breaking strength test. The contract or order shall specify either 1375 or 1500 foot lengths, or both. The first section of tape leaving

23、a loom run shall have a 10 foot sample removed from the lead end. After this every-1375 foot or 1500 foot section shall have 10 feet removed imnediately following every production tape. The rolls of tape shall be marked consecutively as they leave the loom, with the 10 foot specimens marked identica

24、lly with the rolls of tape to which they apply. Test the first 10 foot specimen leaving the loom run and every 10 foot specimen thereafter. Then, the tests shall result in one of the following four possibilities: (see FIGURE 2.) 4.4.2.3.1 Test Result I If the three specimens pass the strength test,

25、the two production tapes in between are satisfactory. 4.5.2.3.2. Test Result II If the first specimen leaving the loom run fails the strength test and the other two specimens pass the strength test, the second pro- duction tape is satisfactory but a 10 foot specimen must then be cut from the lead en

26、d of the first production tape and tested in order to determine if the first tape is satisfactory. If the specimen should fail, the first production tape is unsatisfactory. should pass, the first production tape is satisfactory. If the specimen 4.5.2.3.3 Test Result III If the second specimen fails

27、and the first and third pass the strength test, a 10 foot specimen must be taken from the trailing end of the first production tape and the leading end of the second tape. these two specimens pass, both production tapes are satisfactory. one or both of the specimens fail the strength test, the produ

28、ction tape containing the failed sample is unsatisfactory. 4.5.2.3.4 Test Result IV If If If all specimens fail, proceed with additional tests as outlined above to prove the strength of individual tapes. (Any deviation from the above described procedures shall only be made upon approval by the Conan

29、ding Officer, Naval Air Engineering Center, Attn: Code 913, Lakehurst, NJ 08733.) Page 6 of 9 Licensed by Information Handling ServicesMIL-T-81521A( AS) AMENDMENT 3 10 FOOT SPECIMEN 0/1 IL IT 1/2 2L 2T 2/3 I I I sss II FSS III SFS IV FFF I I -1 r- -J L- - -1 FIGURE 2. 2-Tape loom run Page 7 of 9 e-

30、.-. . Licensed by Information Handling ServicesMIL-T-81521A( AS) AMENDMENT 3 PAGE 11 TABLE III, line 8: Delete “of“ and insert “or.“ PAGE 13 TABLE III, under “Defects“ column, delete the defects along with the entire notation as follows: “Mispick, Double Pick Ident i fi cation Threads I TABLE I I I,

31、 under “Defects“ col umn, add the fol 1 owing defects : DEFECTS DESCRIPTION CRITiCAL MAJOR MINOR Double pick Two or more across the full width X Mi spick Single across the full width X Identification thread Misplaced Missing X X PAGE 14 4.6, delete the entire paragraph and substitute: * count. A cer

32、tificate of compliance shall be submitted from the yarn manufacturer and will be accepted as proof that requirements for type of nylon, melting point, resin, denier, filament count, and bright, high tenacity, light and heat resistant nylon yarn are met. The certificate shall contain verifiable actua

33、l test data. point of the specimens is not known before testing, it shall be determined by a trial run.“ 5.2, lines 4 and 5: 5.2, line 8: “4.6 Type of nylon, melting point, resin, denier and filament If the approximate melting * * Delete “MIL-B-81374 or MIL-B-13239, Type 8-2, Class 1, Grade A“ and s

34、ubstitute “MIL-B-131, class 1.“ Delete “(see Figure 2)“ and substitute “(see FIGURE 3)“. 5.3 Add the following: “CAUTION - Store inside only“ /, ,- Page 8 of 9 -_ (,i Licensed by Information Handling ServicesMIL-T-L52LA (3) 3 At the bottom of the page, de 6.3, last line: Delete “ATTN: and substitute

35、 “ATTN: Code MI L-T-8152 lA( AS) AMENDMENT 3 PAGE 15 ete “Figure 2“ and substitute “FIGURE 3“. PAGE 16 NE-7, Philadelphia, Pennsylvania 19112“ 913, Lakehurst, NJ 08733. I Add the following: “6.5 Resin TR-5418 has proven to be equivalent or even superior to the material specified in 3.6.1. Resin TR-5

36、418, a proprietary material which should not be construed as a sole endorsement, may be obtained from the Spraylat Corporation, 1 Park Avenue, New York, N.Y. 10016 (see 3.6.1). 6.6 Curing of the resin impregnated tape has been accomplished in the temperature range of 115.6 to 182.2OC (240 to 36OoF)

37、(see 3.6.1).“ NOTE: The margins of this amendment are marked with an asterisk to indicate where changes from the previous amendment were made. done a5 a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. are cautioned to evaluate the requirem

38、ents of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. This was Bidders and contractors Preparing Activity: Navy - AS (Project No. 8315-N266) * US. GOVERNMENT PRINTING OFFICE: 1977 - 703-122/569 Page 9 of 9 Licensed by Information Handling Services